Cartoon Network USA has uploaded a sneak peek of the Gem Harvest Steven Universe half-hour special onto YouTube. Gem Harvest will air on Thursday 17th November at 7.30pm ET/PT. In the sneak peek video, Steven works his magic and makes a pumpkin come to life! Lapis and Peridot are disappointed that the newly-living beast doesn’t immediately take to them, but Steven (unknowingly) helps the pumpkin bond with its new gem-owners.